Alternatives
Moving off Anvil
A document-workflow platform that fills existing PDF forms with collected data, generates PDFs from HTML and CSS or from Markdown, and wraps both in e-signature and webform collection, aimed at regulated industries.
Why teams move
- The product is a suite. Generation sits beside e-signature, webforms and OCR, so it is one component of a workflow system rather than the thing the system exists to do.
- The HTML route keeps layout in HTML and CSS. That gives teams direct control, but it also makes print rules part of the code they own.
- Filling a fixed form and composing a document whose length depends on its data are different problems. Anvil supports dynamic, variable-length documents, so the decision here is whether its broader workflow platform or a focused document renderer better fits your stack.
Side by side
Three properties that do not change week to week. No price columns and no feature checkmarks — those go stale quietly, and a comparison that misstates the other tool is worse than none.
| Anvil | pdfs.build | |
|---|---|---|
| What you author | HTML and CSS, or Markdown — or a fixed form whose fields you fill. | A design with a schema, edited in plain English. |
| What decides page breaks | Your stylesheet, on the generation path. | The design states them; the engine composes to them. |
| As the data grows | Anvil supports variable-length documents; HTML/CSS authors own the layout rules. | The ordinary case. Each design records what it does. |
The checkable parts
Claims worth verifying rather than taking on trust — each links to its source, checked September 2026.
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Combines PDF generation, PDF form filling, e-signature and webform collection in a single platform.
Anvil — PDF generation API ↗
What is different here
Composed, not printed
Documents are composed by an engine whose unit is the document rather than the web page, so page breaks, repeating headers and pinned chrome are stated by the design instead of coaxed out of CSS.
Built for documents that grow
The designs here assume the data decides the length. A table that runs to four pages is the ordinary case, not the one that breaks the template.
Behaviour written down
Each design states what happens under real data, so it can be checked before it is trusted with a customer's document.
When to stay with Anvil
It is often the right answer. If any of these describe you, this is not a migration worth making.
- You need e-signature. This does not do it, and bolting a second vendor onto a signing workflow is rarely worth the seam.
- Your documents are fixed forms someone else defined — insurance carrier forms, government filings — and the job is filling fields on a page you cannot redesign. That is Anvil's core competence and not this product's.
- You need the surrounding workflow: webform collection, OCR, and the compliance posture that regulated industries require.
What moving involves
- 1 Only the generated documents are in scope — anything form-filling or signature-bound should stay.
- 2 HTML templates are re-authored rather than ported, which is the point: the layout stops being a stylesheet and starts being a document with stated behaviour.
- 3 The JSON payload usually carries over unchanged, then gains a schema so mismatches fail loudly.
The API reference covers authentication, the render call and error handling; the template gallery has designs to start from rather than a blank page.
Other migrations
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